Onkyo-TXSV-525-Service-Manual(1) 电路图 维修手册.pdf

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1、RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 It should be clear that the base of Q520 should not be more than -1 2vdc and Q518 +1 3vdc Q516 isIt should be clear that the base of Q520 should not be more than -1.2vdc and Q518 +1.3vdc. Q516 is the bias and its turn on is the

2、potential difference of RC components R540 and R538. Q518 also gets its tll d DC iQ526 Aith t thltlifiikitlththtfcontrolled DC via Q526. Assuming that the voltage amplifier is working correctly, then the amount of voltage delivered at the base of Q520 and Q518 should be within the tolerance to be go

3、verned gg (controlled) by Q516. In general practice two possibilities exist in this caseIn general practice two possibilities exist in this case. 1. The base drive voltage coming from Voltage amplifier stage arriving at Q518 and Q520 is to high to be controlled by Q516 and its associated components.

4、 2. Q516 and its associated switching + RC and Voltage divider R-Nets are failing. Q526, C538, D506,2. Q516 and its associated switching RC and Voltage divider R Nets are failing. Q526, C538, D506, D504, R562, are all part of the Q516 operators service as reference control to the bias. Is the problem 1 or 2 or both?Is the problem 1 or 2 or both?